Power outage and iMac

After an almost unnoticeable power outage, my iMac wouldn't power up. After several attempts, the iMac suddenly shut down and finally did not turn back on at all. I made an appointment at the Apple store where I purchased the iMac (Oct. 2021) and they ran tests and fixed it. Said they might have to "change a chip". I recuperated it the next day.

Since then (been 3 weeks) it seems to work fine, but today there was a fleeting, barely noticeable power outage again—some appliances did not even turn off—and the iMac had trouble again turning back on. After disconnecting everything and waiting 10-15 seconds, I was able to power it back up and so far it has not shut down all day.

My question is, is there something I can install to protect the iMac from sudden outages like this? It's an uncomfortable feeling that I could lose access to my computer at any time because of an outage. The last time, three weeks ago, I lost 1 1/2 days, having to get it fixed and set it up again.

Thank you for your help!